Yarn winding process and product



Sept. 26, 1967 H. w. GOODNER YARN WINDING PROCESS AND PRODUCT Filed March 5, 1965 m @N TD N0 0 W ATTORNEY United States Patent Filed Mar. 5, 1965, Ser. No. 437,473 8 Claims. (Cl. 242-48) ABSTRACT OF THE DISCLOSURE A yarn winding process and package of yarn of at least 840 denier wound on small diameter bobbins with a 6-inch traverse stroke and a winding ratio of bobbin revolutions to traverse cycles in the range of 3.354125z1 to 3.41'25002-1.

The term heavy denier yarn and industrial yarn as used herein applies to yarn having a count of approximately 840 total denier and above. Nylon yarns of 840 denier are used in tire cord production and are an example of industrial yarn. conventionally, large diameter packages of heavy denier yarn have not been packaged on small diameter yarn holders, i.e., bobbins, pirns, tubes and cones. Early efforts made to wind large packages of heavy denier yarns on small yarn holders using short traverse strokes of approximately six (6) inches and employing known Wind ratios were unsuccessful. Suggested wind ratios of bobbin revolutions to traverse cycles per minute such as 3:1 and 4: 1 were tried. The packages formed using the known wind ratios were unacceptable and below standard due to pronounced sloughing of the wraps. The problem was particularly difficult in winding so-called flat yarn or yarn having substantially no twist imparted therein. It has been discovered that heavy denier yarns, including flat yarns and yarns having low friction finishes applied thereon, can be successfully wound to form stable, acceptable yarn packages if a specific new and critical decimal winding ratio range is used.

For purposes of illustration, the process and package embodying the invention will be described as carried out on a cone winding machine. It will be understood that other winding apparatus may be used and that the yarn holder need not be a cone but can be a straight tube. In cone winding, a constant ratio of bobbin or spindle revolution (r.p.m.) to yarn traversal rate measured in cycles per minute (c.p.m.) is maintained throughout the packaging operation. A selected ratio of spindle r.p.m. to traversal c.p.m. may be provided by a conventional geargainer mechanism. Success in winding an acceptable and stable yarn package of heavy denier yarn on relatively small diameter cones was achieved employing a critical decimal ratio of spindle r.p.m. to traverse c.p.m. The phrase traverse cycle or a yarn traversal as used herein comprises one back and forth displacement of yarn on a bobbin or package circumference or circumferences.

The object of this invention is to form yarn packages of heavy industrial deniers, particularly those with little or no twist referred to as flat yarns, on small diameter yarn holders employing a critical winding ratio.

According to the invention, stable packages of heavy denier yarn are formed on small diameter bobbins (two inches or less outer diameter for straight or uniform diameter tubes and two inches or less mean outer diameter for cones) using a constant ratio of spindle or bobbin r.p.m. to traverse c.p.m. in the range of 3.354125 :'1 to 3.4l 2500zl.

A better understanding of the invention will be gained by reference to the following descriptionand to the single figure in the accompanying drawing.

The process and product embodying the invention are See illustrated in the drawing in conjunction with a coning machine known as a coner 1. Only the essential features of the coner 1 are shown. Coner 1 includes a spindle 2 driven by motor means 3. A bobbin 4 is mounted on spindle 2 and a traverse guide 5 is positioned adjacent the bobbin. Traverse guide 5 is operatively connected to motor means 3 and adapted for reciprocation back and forth axially of the bobbin. The ratio of spindle r.p.m. to traverse c.p.m. is selectable through an interconnecting gear train 6. A pivoted pressure roller 7 surfacely engages the yarn package being formed, and an adjustable tension device 8 provides a desired tension.

Several examples of successful packaging of heavy denier yarns on small bobbins are given below.

Example I According to this example, packages of eight (8) pound weight were formed of filament yarn having a total denier count of 840 on standard cone bobbins having a 330 taper, a 7% inches length and an outer diameter of approximately two inches at the base thereof. The diameter of the package formed was approximately 9 /2 inches at the base of the cone. Coner 1 was equipped with a gear train to furnish a ratio of spindle or bobbin r.p.m. to traverse c.p.m. of 3.354125 to l. The traverse stroke used was approximately 6 inches. Industrial heavy denier yarn of 840 total denier and 140 filaments was unwound from a supply cake 9 and laced into the traverse guide 5 and about cone 4. Coner 1 was then operated. Stable, commercially acceptable yarn packages were produced. The yarn wraps on the packages tightly interlocked and did not slough. In forming packages, yarn winding tension was maintained at from 40- 45 gms. at start-up and was continually and smoothly decreased to a tension of 18-23 gms. at the end of package formation. Roller 7 pressure at start-up was from 600-800 gms. and was continually and smoothly decreased to -200 gms. at the finish.

Example II Acceptable, stable packages of eight (8) pound yarn packages of heavy denier yarn were formed employing operating conditions similar to those given in Example I with the exception that the packages were wound with a ratio of spindle speed to traverse cycles of 3.412500z1 and with only slight variation in winding tension and roller pressure.

Example III Acceptable, stable packages of live (5) and ten (10) pound weight of heavy denier yarn were also formed employing the same coner referred to in Examples I and II and operating in the range of spindle revolutions to traverse cycle speed of 335412571 and 3.412500:1.

The examples given above relate to cone winding, however, the winding operation can be performed on small straight tubes and bobbins. The critical features that provide a successful winding of yarn packages are the decimal winding ratio range provided, the yarn count, the bobbin size and the traverse stroke used. The tensions and forces of the pressure roll used are within known limits and are not critical.

It will be understood that variations and modifications of the invention are contemplated within the spirit thereof and the scope of the following claims.

I claim:

11. A filament yarn winding process comprising,

delivering yarn having a total denier count of at least 840 to a winding and traversing zone, winding said filament yarn on a driven tubular bobbin, traversing said filament yarn with approximately a 6- inch traverse stroke across said tubular bobbin, maintaining a winding ratio of bobbin revolutions a to traverse cycles in the range of 335410.531 to 3.4l'2500z l, inclusive, while packaging said filament yarn on said tubular bobbin.

'2. A filament yarn winding process as in claim 1, wherein said filament yarn is wound on a straight tubular bobbin having an outer diameter of two inches or less.

3. A filament yarn winding process as in claim 1, wherein said filament yarn is wound on a cone bobbin having a 330 taper and an outer diameter of two inches or less at the base thereof.

4. A filament yarn winding process as in claim 1, wherein said filament yarn is wound on a cone bobbin having a 330 taper and a mean outer diameter of two inches or less.

5. A filament yarn package comprising,

convolutions of filament yarn having a total denier of at least 840 wound on a tubular bobbin,

said filament yarn being spread across approximately 6 inches of the face of said tubular bobbin,

wraps taken around the circumference of said package as related to each back and forth traversal of said filament yarn across said package is within the winding ratio range of 335412511 to 3.412500z1.

6. A filament yarn package as in claim 5, wherein said filament yarn is wound on a straight tubular bobbin having an outer diameter of two inches or less.

7. A filament yarn package as in claim 5, wherein said filament yarn is wound on a cone bobbin having a 330 taper and an outer diameter of approximately two inches or less at the base thereof.

8. A filament yarn package as in claim 5, wherein said filament yarn is wound on a cone bobbin having a 330 taper and a mean outer diameter of two inches or less.

References Cited UNITED STATES PATENTS 2,649,254 8/ 1953 Balthrop 242-43 2,764,368 9/ 1956 Halkyard et a1 242-177 3,193,209 7/1965 Hamb-ach 242.'18

STANLEY N. GILREATH, Primary Examiner. 

5. A FILAMENT YARN PACKAGE COMPRISING, CONVOLUTIONS OF FILAMENT YARN HAVING A TOTAL DENIER OF AT LEAST 840 WOUND ON A TUBULAR BOBBIN, SAID FILAMENT YARN BEING SPREAD ACROSS APPROXIMATELY 6 INCHES OF THE FACE OF SAID TUBULAR BOBBIN, SAID FILAMENT YARN BEING WOUND WHEREIN THE NUMBER OF WRAPS TAKEN AROUND THE CIRCUMFERENCE OF SAID PACKAGE AS RELATED TO EACH BACK AND FORTH TRAVERSAL OF SAID FILAMENT YARN ACROSS SAID PACKAGE IS WITHIN THE WINDING RATIO RANGE OF 3.354125:1 TO 3.412500:1. 